Changing Enhanced Global Mirroring Settings - IBM System Storage DS3000 Programming Manual

add logicalDrive="logicalDriveName" enhancedGlobalMirrorGroup="enhancedGlobalMirrorGroupName"
remotePassword="password"
(repositorylogicalDrive="repos_xxxx" |
repositorylogicalDrive=(logicalDriveGroupName [capacity=capacityValue])
repositorylogicalDrive=(diskPoolName [capacity=capacityValue]))
When you run this command, you must perform these actions:
v Identify the logical drive on the local storage subsystem that you want to mirror to a repository logical
drive on the remote storage subsystem.
v Identify the Enhanced Global Mirror Group in which you want to place the logical drive that you want
to mirror.
v Identify an existing repository logical drive or create a new repository logical drive.
If an unused repository logical drive already exists on the remote storage subsystem, you can reuse that
repository logical drive. Otherwise you must create the repository logical drive. With this command you
have the option of creating a repository logical drive in either a logical drive group or a disk pool. You
identify in which array or a disk pool you want to place the repository logical drive and the size of the
repository logical drive. The storage management software and firmware then creates a repository logical
drive with a name "repos_xxxx" where "xxxx" is a numerical identifier. After the repository logical drive
is created, you cannot rename it.
Establishing the Link Between the primary logical drive and the secondary logical drive
After you have identified a qualified secondary logical drive on the remote storage subsystem and added
the primary logical drive on the local storage subsystem, you must link the two logical drives. Use this
command to link the two logical drives:
establish enhancedGlobalMirror logicalDrive="secondarylogicalDriveName"
enhancedGlobalMirrorGroup="enhancedGlobalMirrorGroupName"
primarylogicalDrive="primarylogicalDriveName"
v secondarylogicalDriveName is the member logical drive on the remote storage subsystem.
v enhancedGlobalMirrorGroupNameNameis the member Enhanced Global Mirror Group that contains the
mirror-pair.
v primarylogicalDriveName is the member logical drive on the local storage subsystem.
After you run this command, the Enhanced Global Mirrored Pair is linked and the initial mirror starts.
During the initial synchronization, all of the data is copied from the primary logical drive to the
secondary logical drive. During the copy operation, the primary logical drive is accessible by all hosts for
write operations, but the secondary logical drive is not ready to use for recovery. During the initial
synchronization, the repository logical drive delta log tracks write requests to the primary logical drive.
At the conclusion of the initial synchronization the repository has any changed data and can be used for
synchronization between the primary logical drive and the secondary logical drive. Because the initial
synchronization is a complete copy between the primary logical drive and the secondary logical drive,
the initial synchronization can take a long time depending on the size of the primary logical drive.
Enhanced Global Mirroring operations can now be performed as you defined when you created the
Enhanced Global Mirror Group.
If you want to make any changes to the synchronization settings between the local, primary logical drive
and the remote secondary logical drive, use the set enhancedGlobalMirrorGroup command.

Changing Enhanced Global Mirroring settings

The set enhancedGlobalMirrorGroupcommand enables you to change the property settings for an
Enhanced Global Mirrored Pair. Use this command to change these property settings:
v Synchronization interval – The time between automatically sending updates of modified data from the
local storage subsystem to the remote storage subsystem.
Chapter 7. About Enhanced Global Mirroring premium feature
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